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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '762d4c369ed37eecf9c47503db117276c2698a7425bb116708ffaa3ceeb74156' 
  AND token = '4M7BNjmDVcrkY+qhkP8E3zPsRyrQlp2j8bcV2cMxKe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00775

JSON explain

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