SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084fe92c39450ffc28dd5d981159434a077e6615c1216eb167c98fdb3566988e' 
  AND token = 'pM62WlKGoBk/QWZwvFsBzjXw9EOBru4RHt4d/3E1sjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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