SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5326ef92c0c19fd772f18d08a1035b001438e79f40ce6e26d818c1cb555e1527' 
  AND token = 'Pqzfsu+GzrVZW+/VawThrT/PT7/PDv25U5k3NJ224vg=' 
  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"
    }
  }
}