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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3d97078fbc11882a5ea37041bae7310291bc78af907669129302b524e3b093ea' 
  AND token = '/ussjseB8lqNWgJlNPHcrn5PWTyc6E9UVdP44I2AGp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00901

JSON explain

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