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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '66ec8cca9b1f3d8e24d4352c7a7937e59b0b852a721fba0efe664559555f8cab' 
  AND token = 'ZzIbcSmUZ/1DJInMEsLqUedRtWhSvPxmuLmE9xn0eM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00793

JSON explain

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