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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0db9bcc0ff877134349cc177ac054eb1c62446fec01b6c0c050ac73b0876304' 
  AND token = 'obbtVGRLhGwXs6kBbb5NU5meLzqU+fLQYLRVX78UGG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}