SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9ad57f807ffc27535f1854cb1ed1b7f68d4d930dff82d7ce576c6a236821fa' 
  AND token = 'ZKTFN24nBcEhlIu/jGty1Qv3+XO1/tbwTtyQnUdLsWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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