Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e7fd07a9be75ca407922a0b38a937118b6e4daefd03e2b47c6baccbde5c6da' 
  AND token = 'FFxYAokEjOWF8SK7Kb/poneU2RdexvTEEEVnggco1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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