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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '504c8b0d921b4037da66c8bf090e03ea4d466da6259668b20d3a39f2fe31bed7' 
  AND token = 'CNcDbaht1UJujHL/ulG4UndSsKb0ZmqJHjM0ia5BOfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00744

JSON explain

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