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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '00b3513acb4d347d75b0d7016e9ae812893bc0ad161cbc1800a1be976a465c1d' 
  AND token = 'RCpcoUbvFuRmn/qC5w3G+vcQ1GJYEEkseczXLGAkX4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00782

JSON explain

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