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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd0e737628bb3b8904fde778a0fe112b9056e488cff09f78883bbaac75a88779c' 
  AND token = '9V9y9Ipw6OeSY+/MvGouRuVLACyFcgWOgtaDukknY7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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