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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd41cb7223f57aebf3f57a568c2ae738bcbb884dc81565f57f9650a85ee899bc9' 
  AND token = 'XN7u1FoS5KeCUTziudtvJ6MFoCnB2anxD8iP5cdBNb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00781

JSON explain

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