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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba45de6c0aaf58ab18f8e1ffd798c946589e87274cafce8b6d81f3814f54fd1' 
  AND token = 'QOuPW7NvqngpX+3nJgmQH171pJ1rA+bJBhtgXPeQw74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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