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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '979eccab2d9343044b131e517282754c898cf15a6482b7a4940244d6808f9f8e' 
  AND token = '2Zv47POS99apk4eTbdRYrQYC1rUteg1uX6ktLdY/Yio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00859

JSON explain

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