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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d404238f86280ee04d6e9958a4f0820407d5f619374f18f2be6a7769f25333' 
  AND token = 'rKX4pdFD+2YDso1TwyfRXzv73VZ24KC04u4Be4p3eg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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