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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a30fa80c1a77fac4252e040c1e8bc08d1e3a19f9a21aa2f8860bdd1b04126b8f' 
  AND token = 'DB52sM2tMLN8qJ/ihsyjJHzgUPmuAcz9ex69df5Rqh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00773

JSON explain

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