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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3b818d7764bbde1aa362d07c1e156eebb777695434281ac9dc283a472bff2502' 
  AND token = 'gyk1bbjwSh7DtEuzUUU4Fdx1SsVmeZwICqafSFV7oEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00767

JSON explain

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