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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b98608b5758e1bea88be53e04688e5c15a4d324b337637f4e43ac374ead4cd7' 
  AND token = 'UyQuzipcttvmr08cliq6tomM7Z0rnr6aFtlVWXhM21E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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