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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c4b73003ea8a0028d15c912dab7bfef88446379ac1b69b720f231766b4dbcb' 
  AND token = 'Zu2oTkE8Cz3+ydgIoM9p7pvrwcFka0DDWTcQ+kNBJyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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