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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1a2a9f3baf13a0216a48b8c3dc90761fa38f2bd71aa4e200374602097b670064' 
  AND token = '0xn94h7N8uEJXl+5iWtHl90i+GOJEBRcf9oclLcdgJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00929

JSON explain

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