Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e78f2f160b591b0956a2deacb323b83ff52c4e92f68315d367a31474e84569' 
  AND token = 'OWaBU8SNIoxMHajB0fexSckS7ToIq2Bu0CDpj+djrSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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