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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f5b1ad3c7fc83af9356563ad5e271fba368680ebfe4c5aeac0c55772e7c102fe' 
  AND token = 'U+LvVtEBB1ReVvhkJKCM0S6y/whjjoFRliQ04taxnuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00772

JSON explain

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