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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f8f44d0af703ab02cda037333de1db4a8c9983c2d7702c68dd4e9208581c8a' 
  AND token = 'kSnbk3/ms8pSjGTNw2xdfkREYDld1cThvwr3iOFSR24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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