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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '129087f8647bd09bf4b61c7ff65345e2489321b44aa4d90f0bf33ef508fee3cc' 
  AND token = '6EWc6pa3HWXohm9BcKEcMqwLKRAJ0H9LfLGUktJfQE8=' 
  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"
    }
  }
}