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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'e4ca5a4d61f0de7b9b5d8638596d139c9fad14a1cb8a87784b672a85ad364874' 
  AND token = 'T5mBL9K/23CKmPBD66NihdK4jCIdZRh/MyszlWN+zAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00753

JSON explain

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