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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '044ee369a702ce53530c332850e27c95cda4a0e840f3fdcd191d06d37d1bb10a' 
  AND token = 'Icwx86nar4pWiwxHv0IHRt8vOH/kK2m32BQ2LEn5cE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00760

JSON explain

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