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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2541cd1ee4639db129bb4d675cac286913d4785f1b0761b94237a85b3a448557' 
  AND token = 'S/NfmIls8TAZa99+9lRU2x0CIYZkh/6v2babVlmqmLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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