SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3de58bf3a373b6344ed6015f3b1a4a762c9fd9bcba2b908a0810855506d52434' 
  AND token = 'uC2UB47szqjlOcVA2+S8QXpp/DnRNtAgpqI3Fdlh6rY=' 
  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"
    }
  }
}