SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45963e6dd4e9a30a49e74a80dd9d600decc6288cf531473787800ff95fd62b5b' 
  AND token = 'j1v+3YmFPKXzVKQX/PaNbqQiVsayl11A46hyRNRLE5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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