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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6e0e303045cffda9d5900ae6c87d4ebe53a273fc433e6cade1cdf014a55bf67b' 
  AND token = '1ANmXTY9/+7qusiCRyHZo12rpPhnUstuz/S+0B45BBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00769

JSON explain

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