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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d924290eeb5934e73032c1980b0321d5c23f22b3e17ac50a95d4b1131389553' 
  AND token = 'hPQPL8MgB7Y8YG7R9S2qGjZs2ez8R0pLmo7c9REYfaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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