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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf169bd4f19b91b62d0ef9479e9827575b9c685a7bb6f4f59e91bfe2f83e5a4' 
  AND token = 'PDPgLhaeXiAcvtKoKEAlaDBSxCJpYs7D/MnZSi8+fP0=' 
  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"
    }
  }
}