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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f1d70442ae2e75200e3edef173c9b332e2abc217229a68785299e2e34e15f486' 
  AND token = 'IdfEENG/ZihAqe6MVQG9VDZkzBMQoRPHTO5sUFqbF9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00775

JSON explain

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