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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6153b79c841c8740bb26a63b8a494ce92d2f6167c2b1011441bcb63533fc9f7' 
  AND token = '/xREKAxWyOlDNK7BkwY/EAFsmqXClxuASfMHmSk0a8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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