Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01c62bb9d239648b4f7a2a9e2575d4608d051a16fe1b924f2a137c0025d7760' 
  AND token = 'z4iiNF44Y4Jr5zaZJFk/1dIDpFpHLfBRiRAuRKgpoLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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