SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87542b5dfda34dbeb0fb58954eb8f66ea00002a3aab2facd6099ef77e1de6c3f' 
  AND token = 'k5llJ68DK1Ig/2jslOdHOTdFejhbgVBvC1BZHhLtIow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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