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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '365f1305b01974dd43cc126ed79d332b7bd212cef06f4a295f3b78b52e5c9f9c' 
  AND token = 'nmC/4Lbd60x3XspYvZBMBoZ5pUrcPe2/FWto5gPlJKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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