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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7c6c72034cb3812c4ae5fd110214580ff0ee3876e2a0a905331dd3a0610166f1' 
  AND token = 'GZ8bZ/q3h/Qy/M7704e2mk6tTEd36hkQdTatX/TjPGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00768

JSON explain

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