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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '8f817e2d6d7701e22216c67c78d0bec4b0f04733771aa930598c86377a0f138c' 
  AND token = 'y04bW5rhNyMRuez9uGFku8xiZAqkZKuEdYS2IUgZqfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00889

JSON explain

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