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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e2ab863b54c6c03d401bd41039e6b234449953374504d09060064f01c17abd' 
  AND token = 'TVxD1zQQBt0+aKlMdJDA8k4fap3FW6pKAm8MQmlDZKg=' 
  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"
    }
  }
}