SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beca3641399f558795157e552c02183512f84e17c640492b3647f3631466dbdb' 
  AND token = 'A1YQBjvonJ62AgWnPPP0XZQ81l1xJ+9ER0NwUVs8f6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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