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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3de5e053e2ba429e2c55febeaa6288e94244e15a6a56d10d720db75d6ec423d3' 
  AND token = '4CGfUabyg8CsTAO0CITauxUU+uXsA6uUocx/4zFkc9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00935

JSON explain

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