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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbace54d8fad6cf559ef652f688e7d70bbd64c77ff6ba7c20b059f25e9d85aba' 
  AND token = 'k5zUgZj6YLiFbmaN6s9mZe50mxAGczzQamiHVdlD2yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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