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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4debb163866b63b4fce6038b9079774e2c8e888e15c9979067722913257a848c' 
  AND token = 'rpXemrs0gHXN5CRGYj8IdOhNyLOtYcS9yOEgMIel5Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00759

JSON explain

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