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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3399c31df6b67e1b152793213f8f53621aa2127787a468279a5e62b71373692d' 
  AND token = 'NOQzhR8NJRss81N5c/Se3nyt4Jkt7919Wc7UmA560OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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