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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc1572a2ebe585de7e00a470ff43e53ab54025684e06cf63b6c82d772033386' 
  AND token = 'au56pE72b5gx+l1TCA9hDO97hLxIfN92sAGAcWkixjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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