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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd124ce9e5f977bee71d57485cce78cb71acd88b97cee907011feef1940fe0fdd' 
  AND token = 'I1XHim9oLpLd/rXZO2x0LnN/iw3LV8hQukStcDj4kQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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