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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '450a90483657296372095a195bef1380bc1a289eb9673a48ba983fbf81bfdcc5' 
  AND token = 'b/9DgqqiBjAlGDIq6jW4tKVATU7cgCof8IV4KteSu6E=' 
  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"
    }
  }
}