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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '975608dd72e9afc9492004d73f8e8d1adc9b067eeb1f537c037743be4ce19ab7' 
  AND token = 'TeQwIgyt8PxhtNGM0hcTyEkXgjUCvCv8lsrgu1zGWfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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