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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8614c806a5048729b1118f10f76aefbe0f9dcb054be9f116e8d6f73e946185e6' 
  AND token = 'y16cnEdqVFeOXtwIFYB+3sPhhiOvu81CTXhElUH44jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00856

JSON explain

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