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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'af47191342949bf3e3a1bfc27f474082064fbe46e72bc76a01dafa9fcdbb5b22' 
  AND token = '7M4rk16RDHd01eSUAksvEuHcO9Y22gejV5QEn3KiOzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00919

JSON explain

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