Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa950acbd45fc08e150dcdd10620f2cdef79acf627fbdc8cdb3366f9736671bc' 
  AND token = '1KVV4AZczRUs0GYqXaNIQyIxjtgltqHMRXogLRcS390=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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