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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1947080eeb0c7b62b5d6d44f54ac1cd38355002bcb7a173975a18a7d91dc66af' 
  AND token = 'kXrIOUPA/v4Rs0wdI+1wd60fnS79XAsG3esmdHaVbs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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