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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc545a7247b901d6e2e82facc9b0900ecc981e87b66b4169e0109d9b55bb4c0' 
  AND token = 'E++6d+AI2O1ff5pVd7jQWUcDdUAwJ9q8VBeXHN9asJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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