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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd7db8b50a96aac4d1e1fef8eed583b10d262c56321f83b5fdfd99b91e4a818c0' 
  AND token = 'AH6f2eiTklUDE74c8pjPacoUmaMPGlOXJiIWeCgXu0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00741

JSON explain

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