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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03696e92945dcf6a4d0256ec409511c938181ec6c0feab3bb446c1436ec19bd1' 
  AND token = '0SJXRFQGmUzr5O7VO7Sahl6thfZq7lS5iymOKGTH8OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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