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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67bd82d7f345fe3be463e7d057dcecc12c05d4d0b6e81f6bc5008957ff153f9' 
  AND token = 'zK5eeYoyrQcD5lvjp0VM+NGhFEYqGs8ULc/XLwUUR4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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