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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753e6711bf2ae678771603bf0d99af9f1946dc2ef9926fa23b1aa52f34ca17a4' 
  AND token = 'EVnv4sbMesuM5YWtVTfamHZHMVcxqX0QRd6noRWaqTE=' 
  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"
    }
  }
}