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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57dc0acd83bb4748f29b37e0ab550600b9b61bdc1502ef6a55d9cee546f6f30d' 
  AND token = 'aLJbe5JxHbIMFz9jfiljsdG6k/gQ+p0AQ5i+7t3Au4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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