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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577ebecdd7168e54b821b5ca47f0abc76ebc585efa0ce97503586b1d5cb69fcd' 
  AND token = 'ydg8NCd0uc67KMh4uV4bgLjFrf7ze9HOKzXvCWjGbgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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