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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3480790be4ca7bd673e39cc2358d0cda8eab2fed4cc5a3071a4a4b81e543adfb' 
  AND token = 'bWzObV53ow1J9tyUhqPMSa0GHc2pPZqs+pVlnUU+8ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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