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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead580726849cf49213bf6d7d5f6c87501d6fb4e02cf40fc241abcba9edc5e46' 
  AND token = 'hgH5ZT4t6OK04SYMcxjiSuC6HTuKz25aErjlFrSXhiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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