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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'd0188c8bc1aca9ae267cae79f4cf346aa5e75425c010f6a1ddcc590c8b5fc99d' 
  AND token = '60DrPqu+olbhOTtytri86uqbwCKedg7BR96pXk8gtbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00777

JSON explain

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