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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '021ae453c9d5ba9c26bb3e3e79c913ef9f65fc1ff08b30cd4790918b3bfbe44f' 
  AND token = 'tHuPyuzO37tXlhC7EnzyOM94G//hBnkTJg7sdYgiWeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01528

JSON explain

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