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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29e28bd323b3020784138e162167f7de107d04481c337dad04b5944139691f1' 
  AND token = 'ut8D1N387xvYxTHMJtuA2NCm9vaF3tnIp6uURDk1e0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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