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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3379665cf622b005977b6d5ff296f1b73822a44cf6089a1a8f2c0e13715f2e40' 
  AND token = 'SOqy4ZcUXy9SUXStvHkGaOVOaHeKNuu01wonKNWQk9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00864

JSON explain

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