SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ad8dcf40e5f98a12375870a6cc99b1d4bc20df9c8d129d95fc50b913900476' 
  AND token = 'bVxyDCmPDbJgFrnq74v3+K89T1V+PaGn9pxQ7Z6ZlQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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